ANTI-LOCK BRAKE SYSTEM(for Type A), Diagnostic DTC:C1271, C1272, C1330, C1331, C1464, C1465

DTC Code DTC Name
C1271 Low Output Signal of Front Speed Sensor RH (Test Mode DTC)
C1272 Low Output Signal of Front Speed Sensor LH (Test Mode DTC)
C1330 Open in Front Speed Sensor RH
C1331 Open in Front Speed Sensor LH
C1464 Front Speed Sensor RH
C1465 Front Speed Sensor LH

DESCRIPTION

Each speed sensor detects wheel speed and sends signals to the skid control ECU (brake actuator assembly). These signals are used by the ABS.

The speed sensor rotors have 48 serrations. The Hall IC type speed sensors use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect the vehicle speed even when the vehicle is nearly stationary.

DTCs C1271 and C1272 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1271 and C1272 are output only in Test Mode.

A01T8OGE19
DTC No. Detection Item DTC Detection Condition Trouble Area
C1271 Low Output Signal of Front Speed Sensor RH (Test Mode DTC) Detected only during Test Mode.

  • Front speed sensor RH

  • Sensor installation

  • Front speed sensor rotor RH (front drive outboard joint shaft assembly RH)
C1272 Low Output Signal of Front Speed Sensor LH (Test Mode DTC) Detected only during Test Mode.

  • Front speed sensor LH

  • Sensor installation

  • Front speed sensor rotor LH (front drive outboard joint shaft assembly LH)
C1330 Open in Front Speed Sensor RH An open or short in the speed sensor signal circuit.

  • Front speed sensor RH

  • Speed sensor circuit

  • Sensor installation
C1331 Open in Front Speed Sensor LH An open or short in the speed sensor signal circuit.

  • Front speed sensor LH

  • Speed sensor circuit

  • Sensor installation
C1464 Front Speed Sensor RH

Any of the following is detected:


  1. The vehicle speed is more than 50.4 km/h (31 mph) and pulses are not input for 0.4 seconds.

  2. After the initial start or restart and when the vehicle speed has reached 12 km/h (7 mph), a wheel speed of 0 km/h (0 mph) is detected.

  3. After the initial start or restart and when the vehicle speed has reached 20 km/h (12 mph), a front wheel speed of 0 km/h (0 mph) is detected.

  4. The following conditions are met for 9 to 72 seconds or more (varies depending on the driving conditions):


    • The difference between the speed of the fastest wheel and the speed of the slowest wheel is 5% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

    • The vehicle speed is less than 100 km/h (62 mph) and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 5 km/h (3 mph) or more. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 16 km/h (10 mph) is allowable.)

    • The vehicle speed is 100 km/h (62 mph) or more and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 6% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

  5. Wheel speed sensor signal fluctuation is equivalent to 98 G or more, or alternates between 50 G or more and -50 G or less.

  6. An abnormal signal is received from a wheel speed sensor.

  • Front speed sensor RH

  • Speed sensor circuit

  • Front speed sensor rotor RH (front drive outboard joint shaft assembly RH)

  • Sensor installation

  • Skid control ECU (brake actuator assembly)
C1465 Front Speed Sensor LH

Any of the following is detected:


  1. The vehicle speed is more than 50.4 km/h (31 mph) and pulses are not input for 0.4 seconds.

  2. After the initial start or restart and when the vehicle speed has reached 12 km/h (7 mph), a wheel speed of 0 km/h (0 mph) is detected.

  3. After the initial start or restart and when the vehicle speed has reached 20 km/h (12 mph), a front wheel speed of 0 km/h (0 mph) is detected.

  4. The following conditions are met for 9 to 72 seconds or more (varies depending on the driving conditions):


    • The difference between the speed of the fastest wheel and the speed of the slowest wheel is 5% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

    • The vehicle speed is less than 100 km/h (62 mph) and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 5 km/h (3 mph) or more. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 16 km/h (10 mph) is allowable.)

    • The vehicle speed is 100 km/h (62 mph) or more and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 6% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

  5. Wheel speed sensor signal fluctuation is equivalent to 98 G or more, or alternates between 50 G or more and -50 G or less.

  6. An abnormal signal is received from a wheel speed sensor.

  • Front speed sensor LH

  • Speed sensor circuit

  • Front speed sensor rotor LH (front drive outboard joint shaft assembly LH)

  • Sensor installation

  • Skid control ECU (brake actuator assembly)

Tech Tips


  • DTCs C1271, C1330 and C1464 are for the front speed sensor RH.

  • DTCs C1272, C1331 and C1465 are for the front speed sensor LH.

WIRING DIAGRAM

A01TDNZE13
*a Front Speed Sensor RH
*b Front Speed Sensor LH
*c Skid Control ECU (Brake Actuator Assembly)

PROCEDURE


  1. READ VALUE USING GTS (FRONT SPEED SENSOR)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Select the Data List using the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Wheel Speed Front wheel speed sensor RH reading Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
      FL Wheel Speed Front wheel speed sensor LH reading Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      FR Wheel Speed
      FL Wheel Speed

    4. Check the speed value output from the speed sensor displayed on the GTS.

      Tech Tips

      Factors that affect the indicated vehicle speed include tire size, tire pressure, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart.

      Click here

      OK
      The speed value output from the speed sensor displayed on the GTS is similar to the speed indicated on the speedometer.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK FRONT SPEED SENSOR INSTALLATION Click here

    OK

  2. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)


    1. Turn the ignition switch off.

    2. Perform the sensor check using the Test Mode procedure.

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      Signal Check
      OK
      No Test Mode DTCs are output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 4 Click here

    OK

  3. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    6. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1330, C1331, C1464 and C1465 are not output. A
      DTCs C1330, C1331, C1464 and/or C1465 are output. B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO STEP 8 Click here

  4. CHECK FRONT SPEED SENSOR INSTALLATION


    1. A01TBUFC10
      *1 Front Speed Sensor
      *a Correct
      *b Incorrect
      *c 8.5 N*m
      *d No clearance

      Turn the ignition switch off.

    2. Check the speed sensor installation.

      OK
      There is no clearance between the sensor and the front steering knuckle.
      The installation bolt is tightened properly.
      Torque
      8.5 N*m (87 kgf*cm, 75 in.*lbf)
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL FRONT SPEED SENSOR CORRECTLY Click here

    OK

  5. CHECK FRONT SPEED SENSOR AND SENSOR ROTOR


    1. Remove the front speed sensor and the component with the sensor rotor.

      for speed sensor: Click here

      for sensor rotor (for 1NR-FE): Click here

      for sensor rotor (for 1ZR-FE): Click here

      for sensor rotor (for 1ND-TV): Click here

    2. Check the speed sensor tip and speed sensor rotor.

      OK
      No scratches, oil, or foreign matter on the sensor tip and rotor.

      Note


      • If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

        If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.

      • Check the speed sensor signal after cleaning or replacement.

        Click here

      Result
      Proceed to
      OK
      NG

    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR)


    1. Install the front speed sensor and the component with the sensor rotor.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    3. Disconnect the A120 skid control ECU (brake actuator assembly) connector and A91 or A92 front speed sensor connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for RH:
      Tester Connection Condition Specified Condition
      A120-16 (FR+) - A91-1 (FR+) Always Below 1 Ω
      A120-16 (FR+) or A91-1 (FR+) - Body ground Always 10 kΩ or higher
      A120-4 (FR-) - A91-2 (FR-) Always Below 1 Ω
      A120-4 (FR-) or A91-2 (FR-) - Body ground Always 10 kΩ or higher
      for LH:
      Tester Connection Condition Specified Condition
      A120-19 (FL+) - A92-1 (FL+) Always Below 1 Ω
      A120-19 (FL+) or A92-1 (FL+) - Body ground Always 10 kΩ or higher
      A120-8 (FL-) - A92-2 (FL-) Always Below 1 Ω
      A120-8 (FL-) or A92-2 (FL-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. RECONFIRM DTC


    1. Reconnect the A120 skid control ECU (brake actuator assembly) connector and A91 or A92 front speed sensor connector.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    6. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1330, C1331, C1464 and/or C1465 are output. A
      DTCs C1330, C1331, C1464 and C1465 are not output. B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  8. REPLACE FRONT SPEED SENSOR


    1. Turn the ignition switch off.

    2. Replace the front speed sensor.

      Click here

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1330, C1331, C1464 and/or C1465 are output. A
      DTCs C1330, C1331, C1464 and C1465 are not output. B

    B

    END

    A

  10. REPLACE FRONT DRIVE OUTBOARD JOINT SHAFT ASSEMBLY


    1. Turn the ignition switch off.

    2. Replace the front speed sensor rotor (front drive outboard joint shaft assembly).

      Click here

      Tech Tips

      The front speed sensor rotor is incorporated into the front drive outboard joint shaft assembly.

      If the front speed sensor rotor needs to be replaced, replace the front drive outboard joint shaft assembly.

      Note

      Check the speed sensor signal after replacement.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1330, C1331, C1464 and C1465 are not output. A
      DTCs C1330, C1331, C1464 and/or C1465 are output. B

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

      Click here


    A

    END

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here